For evaluation of the abnormal bone mineral density and bony lesions, biochemical studies were performed and showed hypophosphatemia (1.6 mg/dL; normal range, 2.7–4.5 mg/dL), normocalcemia (2.2 mmol/L; normal range, 2.02–2.60 mmol/L), an elevated alkaline phosphatase level (597 U/L; normal range, 60–220 U/L), and a normal intact PTH level (17.1 pg/mL; normal range, 16–87 pg/mL). Here, PTH is linked to hypophosphatemia.